School - Dictionary - HLD (Tokina)

 
The abbreviations means
HLD = High-refraction, Low Dispersion
 
 
Explanation from Tokina
Tokina’s wide-angle and standard zoom lenses feature a higher quality of optical glass known as Tokina HLD (High-refraction, Low Dispersion) glass. Having higher refractive index and lower dispersion properties, HLD glass is far less likely than standard optical glass to create lateral chromatic aberration, which is often a problem with conventionally designed wide-angle lenses
 
See links
tokinalens.com




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